Nonlinear geophysics method of effective permeability prediction in engineering geology
B. Maslov, I. Onischuk and O. Kozionova
Event name: 11th International Conference on Monitoring of Geological Processes and Ecological Condition of the Environment
Session: Geophysics In Engineering Geology, Soil Science, Archaeology
Publication date: 19 March 2018
Info: Extended abstract, PDF ( 896.63Kb )
Price: € 20
Methods of nonlinear geophysics are increasingly used for solving practical problems of engineering geology due to the modern capabilities of computer modeling of complex, time-varying processes. The goal of this investigation is modelling and then determination of the structure parameters of the fracture-pore space in terrigenous sandstones. Equipment of the petrophysical laboratory of the Educational and Scientific Institute "Institute of Geology" is used, that allowed to perform experiments under conditions of variable external pressure to confirm the hypothesis of significant nonlinear behavior of porous sandstone and its dependence from amplitude and sign of external load. The model of a nonlinear viscoelastic porous geological media such as Bio proposed is chosen as the basis for further development. The presence of viscous fluid significantly affects the reaction of the medium both in the case of a gradual change in pressure, and with periodic external influences. Constitutive equations with fractional-exponential functions of creep and relaxation are used in the case of triaxiality of stress state.